Copied from upstream:
https://hg.mozilla.org/releases/mozilla-esr38/raw-rev/8c1d40e45a72

# HG changeset patch
# User Xidorn Quan <quanxunzhen@gmail.com>
# Date 1456199544 -28800
# Node ID 8c1d40e45a72c6432e879137a0afa519dc6c9841
# Parent  1dd0ca8e70bd77b6fd93f36cc4e9c2cebfe8ba0a
Bug 1248851 - r=sicking, a=ritu

diff --git a/dom/indexedDB/ActorsParent.cpp b/dom/indexedDB/ActorsParent.cpp
--- a/dom/indexedDB/ActorsParent.cpp
+++ b/dom/indexedDB/ActorsParent.cpp
@@ -14823,22 +14823,19 @@ ObjectStoreAddOrPutRequestOp::DoDatabase
     }
 
     snappy::RawCompress(uncompressed, uncompressedLength, compressed,
                         &compressedLength);
 
     uint8_t* dataBuffer = reinterpret_cast<uint8_t*>(compressed);
     size_t dataBufferLength = compressedLength;
 
-    // If this call succeeds, | compressed | is now owned by the statement, and
-    // we are no longer responsible for it.
     rv = stmt->BindAdoptedBlobByName(NS_LITERAL_CSTRING("data"), dataBuffer,
                                      dataBufferLength);
     if (NS_WARN_IF(NS_FAILED(rv))) {
-      moz_free(compressed);
       return rv;
     }
   }
 
   nsCOMPtr<nsIFile> fileDirectory;
   nsCOMPtr<nsIFile> journalDirectory;
 
   if (mFileManager) {

